Easy Beef Stew using leftovers

In a large pot, add leftover roast, carrots and potatoes, cut into chunks, 1 can of green beans, drained, 1 pkg. of stew seasoning, 1 can of tomatoe sauce, 1/2 cup sliced celery, black pepper and about 2 cups of water. Stir together and heat until bubbly, then reduce heat and simmer until juices are thickened. Serve with crackers or cornbread.